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Sorting an array using multiple values?

by ultranerds (Friar)
on Sep 08, 2011 at 16:53 UTC ( #924872=perlquestion: print w/replies, xml ) Need Help??
ultranerds has asked for the wisdom of the Perl Monks concerning the following question:

Hi,

I'm trying to sort an array, using "paid" listings first, and then "distance"... Here is what I've got to sort them by the distance:

my @loop_sorted = sort { $a->{Distance} <=> $b->{Distance} } @test;

An example of the @loop value would be:
my @test; push @test, { distance => "0.12", name => "Test1", isPaidLink => 0 }; push @test, { distance => "1.2", name => "Test1", isPaidLink => 1 }; push @test, { distance => "4", name => "Test1", isPaidLink => 1 }; push @test, { distance => "9.2", name => "Test1", isPaidLink => 0 }; push @test, { distance => "14", name => "Test1", isPaidLink => 1 }; my @loop_sorted = sort { $a->{Distance} <=> $b->{Distance} } @test;
Basically I need to sort them using : isPaidLink (1 first, then 0 after) ... and then numberically via the "distance" field)

I'm guessing this is possible, but I've never done it before so any pointers would be much appreciated :)

TIA

Andy

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Re: Sorting an array using multiple values?
by AR (Friar) on Sep 08, 2011 at 17:04 UTC

    Firstly, what you have written won't work because you use "distance" in your data structure and "Distance" in your comparison. That being said, here you go:

    my @loop_sorted = sort { $b->{isPaidLink} <=> $a->{isPaidLink} || $a->{distance} <=> $b->{distance} } @test;
      Hi,

      Sorry, the "Distance" vs "distance" was a typo (I had a local test I played with, to get the values right - before using it on the live site , which used ->{Distance} and not ->{distance})

      Your code worked a charm, thanks! I'll have to remember that for the future, as I'm sure I will need similar code at some point

      Thanks again

      Andy

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Corion idly wonders about creating a series of HTTP requests. There seems to be no framework to generate a series of HTTP requests, like "try all these requests"
[Corion]: This is vaguely inspired by that list of "nasty" strings, which I'd like to replace among HTTP parameters, just to see whether the application crashes, but also for easy downloading of a list of URLs etc
[Corion]: Maybe I'll just conoct something using Algorithm::Permute to create an (OO) generator for such requests, or a simple function.

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